package cn.zhz.tools;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

//读取配置文件的工具类-单例模式
public class ConfigManager {
    private static ConfigManager configManager = new ConfigManager();
    private static Properties properties;
    //私有构造器-读取数据库配置文件
    private ConfigManager(){
        String configFile = "database.properties";
        properties = new Properties();
        InputStream is = ConfigManager.class.getClassLoader().getResourceAsStream(configFile);
        try {
            properties.load(is);
            is.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public String getValue(String key){
        return properties.getProperty(key);
    }

    //饿汉模式
    public static ConfigManager getInstance(){
        return configManager;
    }

//	public static synchronized ConfigManager getInstance(){
//		if(configManager == null){
//			configManager = new ConfigManager();
//		}
//		return configManager;
//	}


}
